VLT® AQUA Drive FC 200 - Danfoss VLT Drives - #9

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Sleep Mode Sleep Mode keeps pump wear and power consumption to an absolute minimum. In low fl ow situations, the pump will boost the system pressure and then stop. Monitoring the pressure, the VLT® AQUA Drive will restart when the pressure falls below the required level. Dry Pump Protection lowers maintenance costs The VLT® AQUA Drive constantly evaluates the condition of the pump, based on internal frequency/power measurements. In case of a too low power consump-tion – indicating a no or low fl ow situation – the VLT® AQUA Drive will stop. Motor Alternation This built-in logic controls alternation between two pumps in duty/stand-by applications. Motion of the stand-by pump prevents sticking of the pump. An internal timer assures equal usage of the pumps.With an option card it is possible to control alternations between 8 pumps. Flow compensation The flow compensation feature in VLT® AQUA Drive exploits the fact that flow resistance decreases with reduced flow. The pressure set point is accordingly reduced – which saves energy. Initial/Final Ramp The initial ramp provides fast accelera- tion of pumps to minimum speed, from where the normal ramp takes over. This prevents damage to the thrust bearings on the pump.The fi nal ramp decelerates pumps from min. speed to stop. Payback time indication One of the major reasons for applying a VLT® drive is the very short payback time due to energy savings. The VLT® AQUA drive comes with a unique feature which continuously shows the remaining payback time for the investment. Sensorless Pressure or Flow Control Sensorless pressure or fl ow control is a patented VLT® feature that allows pump manufacturers to control the constant head (pressure) or fl ow levels without the use of sensors. The cost and time of installing, cabling and maintaining pressure and fl ow transducers are eliminated. Reliability is also boosted, as no additional components or connec- tions can cause malfunction.
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